access icon free Grid-connected medium-voltage converters with parallel voltage-source active filters

© The Institution of Engineering and Technology
Received 07/01/2019, Accepted 13/05/2019, Revised 08/05/2019, Published 15/05/2019

Grid-connected medium-voltage converters are typically operated at switching frequencies of several hundred hertz per switch position, requiring bulky and expensive LCL filters in order to meet the harmonic limits given by the grid code. Commonly, semiconductor current derating and increased switching frequencies are used to reduce the LCL-filter costs, leading to a reduced utilisation and efficiency of the converter system. To overcome these disadvantages of conventional converter systems, the presented hybrid converter uses a parallel voltage-source active output filter and thus allows a significant reduction of the passive component demand. The harmonic performance is improved for the operation with small passive filter components, revealing the potential for increasing the utilisation and efficiency of high power medium-voltage converters. As a result, significant reductions of the filter losses and passive components as well as an increased output power are achieved compared to a reference LCL-filter-based converter system.

Inspec keywords: power grids; power convertors; power harmonic filters; switching convertors; power filters; passive filters; electric current control; invertors; active filters

Other keywords: LCL-filter costs; conventional converter systems; grid-connected medium-voltage converters; switching frequencies; parallel voltage-source active filters; expensive LCL; efficiency; reference LCL-filter-based converter system; presented hybrid converter; high power medium-voltage converters; parallel voltage-source active output filter; passive filter components; filter losses; reduced utilisation; switch position; grid code; bulky LCL

Subjects: Power convertors and power supplies to apparatus; Power supply quality and harmonics; Current control; Control of electric power systems; Other power apparatus and electric machines

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